This calculator determines the water depth to reach or given pressure or the pressure at a given depth. You can enter the depth or pressure input with most common units and it will be converted automatically. This calculator does not add air pressure at the surface - the results are relative to the surface pressure.
See here for an explanation of static fluid pressure.
For watertight enclosure design, please check out Under Pressure.
This calculator uses the js-quantities library by gentooboontoo for unit conversions.